A LevelChemistryAQARevision NotesOrganic ChemistryAlkenesTest for Unsaturation

Test for Unsaturation (AQA A Level Chemistry)

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Test for Unsaturation

  • Halogens can be used to test if a molecule is unsaturated (i.e. contains a double bond)

  • Br2(aq) is an orange or yellow solution, called bromine water and this is the halogen most commonly used

  • The unknown compound is shaken with the bromine water

  • If the compound is unsaturated, an addition reaction will take place and the coloured solution will decolourise

Hydrocarbons Bromine Water, downloadable AS & A Level Chemistry revision notes

The decolourisation of bromine water by an unsaturated compound as a result of an addition reaction

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    Francesca

    Author: Francesca

    Expertise: Head of Science

    Fran studied for a BSc in Chemistry with Forensic Science, and since graduating taught A level Chemistry in the UK for over 11 years. She studied for an MBA in Senior Leadership, and has held a number of roles during her time in Education, including Head of Chemistry, Head of Science and most recently as an Assistant Headteacher. In this role, she used her passion for education to drive improvement and success for staff and students across a number of subjects in addition to Science, supporting them to achieve their full potential. Fran has co-written Science textbooks, delivered CPD for teachers, and worked as an examiner for a number of UK exam boards.